628 



SCIENCE 



[N. S. Vol. XLI. No. 1061 



the hot room (112 mm. against 116) and 

 the Crampton value was markedly de- 

 creased, averaging 35 for the hot room, 45 

 for the warm room and 60 for the cool room. 



D/FFERENCE IN 

 PcilS£-RATE-/NCflFAS£- 

 ON-STANDi/^e 

 'AT BESMN/MG ANP ENO OF PEff/Pff 



^Z 



75' 68' 



Room Temperature, fahr. 



Fig. 3. Eelation between Room Temperature 

 and Average Difference between Inerease-in-Pulse- 

 Eate-on-Standing after reclining at end of period 

 and similar increase at beginning of period. 



Elaborate psychological tests of color nam- 

 ing, naming opposites, addition, cancella- 

 tion, mental multiplication, typewriting and 

 grading specimens of handwriting, rhymed 

 couplets and prose compositions, all failed 

 entirely to show any effect of even the 

 severe 86° — 80 per cent, relative humidity 

 condition upon the power to do mental 

 work under the pressure of a maximal 

 efSciency test. Option tests of the inclina- 

 tion to do work, in which the subjects had 

 the choice of doing mental multiplication 

 or typewriting for pay, or of reading novels 

 or doing nothing, showed a distinct lessening 



in the total amount of work done in the hot 

 room while with male subjects whose votes 

 as to comfort showed no preference for the 

 68° over the 75° condition there was as 



Fig. 4. Eelation between Eoom Temperature 

 and Average Systolic Blood Pressure of all sub- 

 jects at end of day. 



much accomplished in the warm as in the 

 cool room. We plan to repeat these experi- 

 ments with women subjects who may prob- 

 ably be more susceptible to slight degrees of 

 overheating. 



The results with physical work (lifting 

 dumbbells and riding a stationary bicycle) 

 were much more definite. Again maximum 

 effort tests showed no appreciable influence 

 of room temperature, but when the subjects 

 had a choice they accomplished 15 per 

 cent, less work at 75° and 37 per cent, less 

 at 86° than at 68°. These conclusions are 

 quite what one would expect. Under pres- 

 sure efBcient work can usually be accom- 



